Possible observation of the Berezinskii-Kosterlitz-Thouless transition in boron-doped diamond films

被引：10

作者：

Coleman, Christopher

Bhattacharyya, Somnath ^{[1
]}

机构：

[1] Univ Witwatersrand, Nanoscale Transport Phys Lab, WITS, Private Bag 3, ZA-2050 Johannesburg, South Africa

来源：

AIP ADVANCES | 2017年 / 7卷 / 11期

关键词：

NANOCRYSTALLINE DIAMOND; SUPERCONDUCTIVITY; TEMPERATURE;

D O I：

10.1063/1.4986315

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The occurrence of the Berezinskii-Kosterlitz-Thouless (BKT) transition is investigated in heavily boron-doped nanocrystalline diamond films through a combination of current-voltage and resistance measurements. We observe transport features suggesting a robust BKT transition along with transport features related to vortex pinning in nanocrystalline diamond films with smaller grain size. The vortex core energy determined through analysis of the resistance temperature curves was found to be anti-correlated to the BKT transition temperatures. It is also observed that the higher BKT temperature is related to an increased vortex-antivortex binding energy derived from the activated transport regions. Further, the magnetic field induced superconductor insulator transition shows the possibility of the charge glass state. The consequences of granularity such as localization and vortex pinning can lead to tuneable BKT temperatures and strongly affects the field induced insulating state. (C) 2017 Author(s).

引用

页数：8

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